Question: What are the ring system  which start with the letter r
Paraphrase: Name the ring systems that begin with alphabet R.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q28951811 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: rings of Uranus, rings of Uranus, Rings of Rhea, Rings of Rhea, Rings of Earth, Rings of Earth, Rings of Pluto, Rings of Pluto, rings of Jupiter, rings of Jupiter, Rings of Saturn, rings of Saturn, rings of Neptune, rings of Neptune